Shahid Chamran University of Ahvaz
Journal of Hydraulic Structures
2345-413X
2345-4156
3
2
2017
12
01
Investigating the vulnerability downstream area of Taleghan dam due to dam failure
1
9
EN
Hamid
Goharnejad
Department of Civil Engineering, Environmental Sciences Research Center, Islamshahr Branch, Islamic Azad university, Islamshahr, Iran
h.goharnejad@iiau.ac.ir
Mahyar
Azizkhani
Department of Civil Engineering, Environmental Sciences Research Center, Islamshahr Branch, Islamic Azad university, Islamshahr, Iran
m.azizkhani78@gmail.com
Mahmoud
Zakeri Niri
Department of Civil Engineering, Environmental Sciences Research Center, Islamshahr Branch, Islamic Azad university, Islamshahr, Iran
m.zakeri.w90@gmail.com
Saber
Moazami
Department of Civil Engineering, Environmental Sciences Research Center, Islamshahr Branch, Islamic Azad university, Islamshahr, Iran
saber.moazami@gmail.com
10.22055/jhs.2017.13435
Due to the immense damage caused by dam failure, especially dams constructed near large cities, it is necessary to consider the breaking phenomena as well as studying and designing different parts of the dam. For this purpose, the hydrograph of the outflow due to dam failure must be identified according to size of the fracture and then flood routing, and flood zone must be determined based on the downstream topography and morphology. The integration of hydraulic models and geographic information system is used to achieve this objective. In this research the effect of breaking Taleghan storage dam due to the slip of a pile of reservoir abutment and the creation of current wave toward the dam body as well as the vulnerability analysis due to the breaking of the dam on downstream lands was studied. At first, Taleghan dam failure for five different scenarios was modeled using the FLOW-3D numerical software and then the geometric data of the river was extracted using the ArcGIS software and modeling the flood due to dam failure was conducted in Hec-GeoRas model. Then, the risk analysis was performed for each break scenario of Taleghan dam. The results indicated that the maximum amount of inundation would occur in Razmian city at an approximate distance of 45 kilometers from Taleghan dam site.
Dam breaking,Inundation,Vulnerability,Risk analysis,Taleghan dam
https://jhs.scu.ac.ir/article_13435.html
https://jhs.scu.ac.ir/article_13435_a19e9aa0b4c91d17a43f5f1b69bda628.pdf
Shahid Chamran University of Ahvaz
Journal of Hydraulic Structures
2345-413X
2345-4156
3
2
2017
12
01
An experimental study on hydraulic behavior of free-surface radial flow in coarse-grained porous media
10
21
EN
Ali
Rajabi
Department of Engineering Geology, School of Geology, College of Science, University of Tehran, Tehran, Iran.
amrajabi@ymail.com
Elham
Hatamkhani
Department of Civil Engineering, Faculty of Civil Engineering, University of Qom , Qom, Iran.
elhamhatamkhani@yahoo.com
Jalal
Sadeghian
0000-0003-1030-5644
Department of Civil Engineering ,Faculty of Engineering , Bu Ali Sina University, Hamedan, Iran.
j.sadeghian@basu.ac.ir
10.22055/jhs.2018.24185.1059
The equations of fluids in porous media are very useful in designing the rockfill and diversion dams, gabions, breakwaters and ground water reserves. Researches have been showed that the Forchheimer equation is not sufficient for the analysis of hydraulic behavior of free-surface radial flows; because, in these flows, in addition to the hydraulic gradient and velocity, the variable of radius is also an independent parameter due to variations in cross section. In this paper, we have used an experimental model to analyze the nonlinear free surface radial flows and to introduce an equation compliant with these flows. This is a semi cylindrical model including a type of coarse grained aggregate which leads the radial flow into the center of a well. Thereafter, the hydraulic gradient was measured on different points of the experimental model by three distinguished methods of difference of successive radii, keeping constant the minimum and maximum radii. An equation, describing the behavior of free surface radial flow, was then proposed by measured data (as regression data) from the laboratory and analysis of the results. Verification of the proposed equation by test data shows that the equation is valid on the established limits of the data.
Hydraulic gradient,Hydraulic behavior,Forchheimer,Porous media,Radial flow
https://jhs.scu.ac.ir/article_13436.html
https://jhs.scu.ac.ir/article_13436_949cb8945cf37565aa5f01971ac1300f.pdf
Shahid Chamran University of Ahvaz
Journal of Hydraulic Structures
2345-413X
2345-4156
3
2
2017
12
01
Three-dimensional numerical modeling of score hole in rectangular side weir with finite volume method
22
31
EN
samira
ghotbi
Department of Civil Engineering , Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran.
sami_ghotbi@yahoo.com
Azam
Abdollahi
Department of Civil Engineering , Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran.
abdollahiazam@yahoo.com
Mehdi
Azhdari Moghadam
Department of Civil Engineering , Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran.
mazhdary@eng.usb.ac.ir
10.22055/jhs.2018.24654.1062
Local scouring in the downstream of hydraulic structures is one of the important issues in river and hydraulic engineering, which involves a lot of costs every year, so the prediction of the rate of scour is important in hydraulic design. Side weirs are the most important of hydraulic structures that are used in passing flow. This study investigate the scouring due to falling jet from side weir in downstream in side channel numerically. The simulation was done with finite volume method. The comparison of numerical and experimental results of flow fields shows agreement. Results show that from upstream to downstream of side weir located in side channel, scoring is increased and the dimensions of the scour hole in the downstream of the rectangular side weirs increase along it. In fact, at the downstream of the lower edge of side weirs in side channel, scouring has the greatest dimensions; in particular the depth.
Scour,Side weir,Three dimensional,modeling,and Finite volume method
https://jhs.scu.ac.ir/article_13437.html
https://jhs.scu.ac.ir/article_13437_5252b8bfc67ed5e56535e2e8fbc12369.pdf
Shahid Chamran University of Ahvaz
Journal of Hydraulic Structures
2345-413X
2345-4156
3
2
2017
12
01
Experimental Study of the Effect of Base-level fall at the Beginning of the Bend on Reduction of Scour around a Rectangular Bridge Pier Located in the 180 Degree Sharp Bend
32
46
EN
Mohammad
vaghefi
0000-0001-5862-915X
Department of Civil Engineering, Faculty of Engineering, Persian Gulf University, Bushehr, Iran.
vaghefi@pgu.ac.ir
Mohammad
moghanloo
Department of Civil Engineering, Faculty of Engineering, Persian Gulf University, Bushehr, Iran.
mhm4538@gmail.com
Danesh
Dehghan
Department of Civil Engineering, Faculty of Engineering, Persian Gulf University, Bushehr, Iran.
daneshdehghan94@gmail.com
Arsalan
keshavarz
Department of Civil Engineering, Faculty of Engineering, Persian Gulf University, Bushehr, Iran.
arsalan.keshavarz2011@gmail.com
10.22055/jhs.2018.24900.1065
Base-level fall in river beds occurs due to varying natural or unnatural causes. Base-level fall causes the change in the behavior of flow at the location of drop in base-level. In such situations, most of scour occur at the foot of the slope, and slope wall retreats in the upstream direction. This phenomenon widens the wall of the river bank, thus leading to its destruction. The amount of bed topography variations and scour around a rectangular bridge pier with an oblong nose located in the 90 degree angle of a 180 degree sharp bend was studied in this work by generating base-level fall at the beginning of the 180 degree sharp bend, and it was compared with a case without a base-level fall. The results indicated that in the case of base-level fall at the upstream side of the bridge pier, increase in flow depth, as well as reduction in velocity at the area around the pier, is observed, and the maximum depth of scour hole and the volume of scour hole around the pier respectively reduce by 73 and 97% in comparison with those in the case where no base-level fall occurs.
180 Degree Sharp Bend,base-level fall,Scour,Bridge pier,Topography
https://jhs.scu.ac.ir/article_13461.html
https://jhs.scu.ac.ir/article_13461_544067bb9900bc277a14563ed52bdc7f.pdf
Shahid Chamran University of Ahvaz
Journal of Hydraulic Structures
2345-413X
2345-4156
3
2
2017
12
01
Developing optimal operating reservoir rule-curves in drought periods
47
61
EN
soroosh
alahdin
Department of Civil Engineering, Faculty of Engineering , Shahid Chamran University of Ahvaz, Ahvaz, Iran.
s-alahdin@phdstu.scu.ac.ir
Hamid
Ghafouri
Department of Civil Engineering, Faculty of Engineering , Shahid Chamran University of Ahvaz, Ahvaz, Iran.
ghafouri_h@scu.ac.ir
10.22055/jhs.2017.13490
In this study a simulation-optimization model is developed for deriving operation rule-curves in drought periods. To each reservoir, two rule-curves with adjustable monthly levels are introduced dividing the reservoir capacity into three zones between the normal water level and minimum operation level. To each zone of a reservoir and for each month of the year a hedging coefficient is introduced that determines the release from the reservoir. Accordingly, an optimization problem is developed in which the objective is the minimization of water demands deficits in drought and the decision variables are the rule-curves levels and hedging coefficients. For optimization of the problem, a genetic algorithm equipped with a self-adaptive constraint handling strategy is used. To evaluate the objective function and constraints violations, the flexible and widely-used WEAP simulation model is exploited and coupled to the optimization solver. The model is then applied to the Zohreh three-reservoir system in the southwest of Iran and compared to the Standard Operation Policy (SOP). According to the sustainability indices for the system operated in drought, the obtained operating rule-curves are found significantly superior to the SOP. As a result of applying the rule-curves, the modified shortage index (MSI) and vulnerability (extent) of the system are respectively improved by 22% and 28% compared to the SOP. Consequently, the developed policy application resulted in longer periods of deficit (but less severe) as shown by decrease in reliability (5%) and resilience (40%) indices.
Operating policy,Rule-Curve,Sustainability Indices,Optimization Model,hedging
https://jhs.scu.ac.ir/article_13490.html
https://jhs.scu.ac.ir/article_13490_d1fb023114c3211b416412678179952f.pdf
Shahid Chamran University of Ahvaz
Journal of Hydraulic Structures
2345-413X
2345-4156
3
2
2017
12
01
Finding the Causes and Evaluating Their Impacts on Urmia Lake Crisis Using a Comprehensive Water Resources Simulation Model
62
77
EN
Alireza
Dariane
Department of Civil Engineering, KN Toosi University of Technology, Tehran, Iran.
borhani@kntu.ac.ir
Leila
Eamen
Department of Civil Engineering, K.N. Toosi University of Technology, Tehran, Iran.
leilaimen@gmail.com
10.22055/jhs.2018.24762.1064
Urmia Lake in northwestern Iran has been facing critical water level shrinkage in recent years with serious environmental consequences. It is expected that with the current trend, the lake will be completely dried out in a few years from now. This study attempts to assess the impacts of human activities on water level fluctuations of Urmia Lake by developing a comprehensive hydrologic simulation model. Model development and calibration was carefully accomplished by utilizing effective water resources management components in the basin. An important contribution was accomplished by properly estimating the agricultural water demand and consumption in the absence of measured data. Result of long-term simulation reveals that excessive water consumption by inefficient and expanding irrigated agriculture is the main reason for Urmia Lake shrinkage. It was found that main reservoirs are only responsible for 23% of current situation. Whereas, 77% of the current crisis has been caused by miscellaneous agricultural water withdrawals in the basin.
Agricultural Development Projects,Comprehensive Water Resources Simulation,Lake Level Fluctuations,Urmia Lake Basin
https://jhs.scu.ac.ir/article_13515.html
https://jhs.scu.ac.ir/article_13515_11c6cea5c13f2e70301e9b8223c2654a.pdf